Not by cable
You need a 56k modem installed,and the phone line attached.
Best i can do but you should be getting more replys then you have.
It can be done,but thats all i can add except,
It's completly seperate from useing your cable for browsing.
And make it an updated post.
But yes there are places that do this.Depending on where for Long distance
charges.
Ididmy had a better way,this is the hard way.